Relevant bibliographies by topics / HP 1240

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Academic literature on the topic 'HP 1240'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 February 2022

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Journal articles on the topic "HP 1240"

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Misiuk, Andrzej, Jadwiga Bak-Misiuk, Barbara Surma, Wojciech Wierzchowski, Krzysztof Wieteska, Charalampos A. Londos, Nikolai V. Abrosimov, and Jacek Kucytowski. "Impact of Hydrostatic Pressure Applied at Annealing on Homogeneity of Si-Ge Single Crystals." Solid State Phenomena 178-179 (August 2011): 35–40. http://dx.doi.org/10.4028/www.scientific.net/ssp.178-179.35.

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Creation and transformation of defects in single crystalline (001) oriented Si-Ge with about 5.6 at. % Ge content, containing oxygen interstitials, Oi’s, at 9x1017cm-3 level, were investigated, after processing for 5 h at up to 1400 K (HT) under Ar pressure to 1.1 GPa (HP), by X-ray, synchrotron, infrared and photoluminescence methods. To create nucleation centres for Oi’s precipitation, some samples were pre-annealed for 10 h at 1000 K under 105 Pa. HT-HP treatment at 1230/1400 K results in improved sample homogeneity and crystallographic perfection. HT-HP induced changes in Si-Ge are related mainly to HP-stimulated diffusivity of Ge.
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Riecken, Jan F., Gunter Heymann, Wilfried Hermes, Ute Ch Rodewald, Rolf-Dieter Hoffmann, Hubert Huppertz, and Rainer Pöttgen. "High-pressure / High-temperature Studies on the Stannides RENiSn (RE = Ce, Pr, Nd, Sm) and REPdSn (RE = La, Pr, Nd)." Zeitschrift für Naturforschung B 63, no. 6 (June 1, 2008): 695–706. http://dx.doi.org/10.1515/znb-2008-0616.

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The normal-pressure (NP) orthorhombic TiNiSi-type (space group Pnma) stannides RENiSn (RE = Ce, Pr, Nd, Sm) and REPdSn (RE = La, Pr, Nd) were transformed into the corresponding hexagonal ZrNiAl-type (space group P6̄2m) high-pressure (HP) modifications under multianvil high-pressure (7.5 - 11.5 GPa) high-temperature (1100 - 1200 °C) conditions. The structures of NP-CeNiSn, HPPrNiSn, NP-NdNiSn, HP-LaPdSn, HP-PrPdSn, and HP-NdPdSn were refined from single crystal X-ray diffractometer data. Structural data for HP-SmNiSn were obtained from a Rietveld powder refinement. The high-pressure phase transition significantly changes the rare earth coordination, i. e. 4 RE + 6 Ni(Pd) + 6 Sn atoms for the NP-phases and 6 RE + 5 Ni(Pd) + 6 Sn atoms for the HPphases. Susceptibility measurements of HP-PrPdSn and HP-NdPdSn reveal paramagnetic behavior with experimental magnetic moments of 3.61(1) μB/Pr atom and 3.66(1) μB/Nd atom, respectively. Low-temperature susceptibility and specific heat data point to inhomogeneous magnetism and spinglass behavior, respectively.
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Varodi, Codruta, Florina Pogacean, Marin Gheorghe, Valentin Mirel, Maria Coros, Lucian Barbu-Tudoran, Raluca-Ioana Stefan-van Staden, and Stela Pruneanu. "Stone Paper as a New Substrate to Fabricate Flexible Screen-Printed Electrodes for the Electrochemical Detection of Dopamine." Sensors 20, no. 12 (June 26, 2020): 3609. http://dx.doi.org/10.3390/s20123609.

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Flexible screen-printed electrodes (HP) were fabricated on stone paper substrate and amperometrically modified with gold nanoparticles (HP-AuNPs). The modified electrode displayed improved electronic transport properties, reflected in a low charge-transfer resistance (1220 Ω) and high apparent heterogeneous electron transfer rate constant (1.94 × 10−3 cm/s). The voltammetric detection of dopamine (DA) was tested with HP and HP-AuNPs electrodes in standard laboratory solutions (pH 6 phosphate-buffered saline (PBS)) containing various concentrations of analyte (10−7–10−3 M). As expected, the modified electrode exhibits superior performances in terms of linear range (10−7–10−3 M) and limit of detection (3 × 10−8 M), in comparison with bare HP. The determination of DA was tested with HP-AuNPs in spiked artificial urine and in pharmaceutical drug solution (ZENTIVA) that contained dopamine hydrochloride (5 mg/mL). The results obtained indicated a very good DA determination in artificial urine without significant matrix effects. In the case of the pharmaceutical drug solution, the DA determination was affected by the interfering species present in the vial, such as sodium metabisulfite, maleic acid, sodium chloride, and propylene glycol.
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Vitzthum, Daniela, Ingo Widmann, Markus Plank, Bastian Joachim-Mrosko, and Hubert Huppertz. "High-pressure synthesis and crystal structure of HP-Al2B3O7(OH)." Zeitschrift für Naturforschung B 75, no. 11 (November 26, 2020): 975–81. http://dx.doi.org/10.1515/znb-2020-0151.

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AbstractOrthorhombic HP-Al2B3O7(OH) was synthesized in a Walker-type multianvil apparatus under high-pressure/high-temperature conditions of 12.4 GPa and 1200 °C, respectively. Its structure is isotypic to that of Ga2B3O7(OH) and has been determined via single-crystal X-ray diffraction at room temperature. HP-Al2B3O7(OH) crystallizes in the space group Cmce (Z = 8) with the lattice parameters a = 10.3124(4), b = 7.3313(3), c = 10.4801(5) Å, and V = 792.33(6) Å3. The compound has also been characterized by IR and Raman spectroscopy.
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Sumardiyanto, Didit, and Sri Endah Susilowati. "PENGARUH TEKANAN POMPA BAHAN BAKAR TEKANAN TINGGI TERHADAP KINERJA MESIN." JURNAL KAJIAN TEKNIK MESIN 3, no. 2 (August 24, 2018): 98–105. http://dx.doi.org/10.52447/jktm.v3i2.1421.

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AbstrakPenelitian ini dilakukan untuk mengetahui pengaruh pompa injeksi bahan bakar tekanan tinggi terhadap kinerja sebuah mesin pada mesin penggerak utama MV. ALAM JAYA II yang menggunakan mesin diesel YANMAR type M22-EN. Berdasarkan data-data yang diperoleh dilapangan, setelah dilakukan pembahasan bahwa tekanan pompa injeksi berpengaruh pada kinerja mesin diesel. Untuk tekanan pompa injeksi sebesar 820 kgf/cm2, kinerja yang dihasilkan mesin adalah : Daya Indikator 1204 kgf/cm2, Daya Efektif 1016 kgf/cm2, Efisiensi Thermal Efektif 32,0% dan konsumsi bahan bakar spesifik sebesar 192 g/hp.h. Sedangkan setelah dilakukan perbaikan pompa injeksi, tekanan pompa menjadi 1120 kgf/cm2, kinerja yang dihasilkan oleh mesin adalah : Daya efektif 1399 hp, Daya Efektif 1195 hp, Efisiensi Thermal Efektif : 37.32%, dan Konsumsi Bahan Bakar Spesifik sebesar 165.7 g/hp.h Dengan adanya perbaikan pompa injeksi sehingga dapat menaikkan tekanan injeksi dari 880 kgf/cm2 menjadi 1120 kgf/cm2, maka kinerja mesin dapat ditingkatkan Kata kunci: mesin diesel,pompa injeksi, kinerja mesin AbstractThis research was conducted to determine the effect of high pressure fuel injection pump on the performance of a machine on the MV main drive engine. ALAM JAYA II which uses the YANMAR type M22-EN diesel engine. Based on the data obtained in the field, after discussion that the injection pump pressure affects the performance of the diesel engine. For injection pump pressure of 820 kgf /cm2, the engine performance is: Indicator Power 1204 kgf /cm2, Effective Power of 1016 kgf /cm2, Effective Thermal Efficiency of 32.0% and specific fuel consumption of 192 g / hp.h. Whereas after the injection pump repairs, the pump pressure becomes 1120 kgf / cm2, the performance produced by the engine is: Effective 1399 hp, Effective 1195 hp, Effective Thermal Efficiency: 37.32%, and Specific Fuel Consumption of 165.7 g / hp. H With the improvement of the injection pump so that it can increase the injection pressure from 880 kgf / cm2 to 1120 kgf /cm2, the engine performance can be improvedKeywords: diesel engine, injection pump, engine performance
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Bow, J. S., M. J. Kim, and R. W. Carpenter. "Comparative Oxidation Studies of Polycrystalline HP and CVD Silicon Carbides by TEM." Proceedings, annual meeting, Electron Microscopy Society of America 49 (August 1991): 938–39. http://dx.doi.org/10.1017/s0424820100089007.

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The excellent oxidation resistance of SiC at high temperature results from formation of a protective SiO2 layer in a strongly oxidizing environment. The oxide layer is often initially amorphous, may transform to a crystalline phase for extended reaction time, especially crystobalite above 1200°C. Our objective is use of high resolution electron microscopy methods to determine the oxide layer microstructure dependence on SiC substrate type, and especially to investigate existence of an intermediate Si-O-C phase between the oxide layer and substrate.
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Bao, Y., Z. Jin, and L. Sun. "Strength degradation and lifetime prediction of HP-Si3N4/TiC under static load at 1200°C." Materials Letters 45, no. 1 (August 2000): 27–31. http://dx.doi.org/10.1016/s0167-577x(00)00069-0.

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Misiuk, Andrzej, Alexander G. Ulyashin, Adam Barcz, and Peter Formanek. "Accumulation of Hydrogen within Implantation-Damaged Areas in Processed Si:N and Si:O." Solid State Phenomena 156-158 (October 2009): 319–24. http://dx.doi.org/10.4028/www.scientific.net/ssp.156-158.319.

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Accumulation of hydrogen in Czochralski silicon implanted with N2+ (Si:N; N dose, DN=1–1.8x1018 cm-2; energy E=140 keV) or O2+ (Si:O; DO=1x1017 cm-2; E=200 keV), processed at up to 1400 K (HT) under enhanced Ar pressure, up to 1.2 GPa (HP), and followed by treatment in hydrogen (deuterium) plasma, was investigated by Secondary Ion Mass Spectroscopy. Implantation produces buried amorphous layer. As determined by transmission electron microscopy, subsequent HT-HP processing results in a formation of a specific sample microstructure. In plasma treated as-implanted Si:N, hydrogen accumulates at a depth of about 50 nm, up to concentration 2x1021 cm-3. This concentration is twice lower at a depth ≈ 80–250 nm. Deuterium content remains almost unchanged after plasma treatment of Si:N prepared by processing at 1270 K while it is strongly dependent on DN and on HP. In plasma treated Si:O, prepared by processing at 920-1230 K, hydrogen profile corresponds to that of implanted oxygen and decreases with HP. Comparative analysis of hydrogen accumulation and its subsequent release at 720-920 K in the Si:N and Si:O structures indicates that the capacity of buried layers in Si:O to getter and to preserve hydrogen is higher than that in Si:N.
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Morishima, SatoKo, Seishi Ogawa, Takakazu Kawase, Aiko Matsubara, Yasuhito Nanya, Koichi Kashiwase, Hiroo Saji, et al. "Impact of Highly Conserved HLA Haplotype on Acute Graft-Versus-Host Disease in Unrelated Bone Marrow Transplantation." Blood 112, no. 11 (November 16, 2008): 59. http://dx.doi.org/10.1182/blood.v112.11.59.59.

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Abstract [INTRODUCTION] Although the effect of HLA locus and/or HLA antigen matching on clinical outcome of unrelated bone marrow transplantation (UR-BMT) has been well characterized, the effect of HLA haplotype (HP) itself is little known. The large scale genotyping of HLA-A, B, C, DRB1, DQB1, DPB1 alleles and SNPs among HLA region by whole genome association scans (WGAS) made it possible to ellucidate conserved common HPs and their impact to acute GVHD in HLA allele matched Japanese patient-donor pairs through Japan Marrow Donor Program. [PATIENTS AND METHODS] 5210 patients who received T cell replete marrow were retrospectively typed for HLA-A, B, C, DRB1, DQB1 and DPB1 allele, and 1810 pairs performed WGAS using Affimetrics 500k array. HLA allele fullmatch was found in 712 pairs, of whom 451 pairs were genotyped 912 SNPs between HLA-A and HLA-DPB2 (from nucleotide 29989443 to 33205942, 3.2Mb). 45 common HLA-A, B, C, DRB1, DQB1, DPB1 HPs among Japanese (designated as HP-P1 to HP-P45) was determined according to the combination of HLA alleles. The probabilities of acute GVHD (grade 2–4) were estimated using the cumulative incidence function, where death without acute GVHD was regarded as a competing risk. Hazard risk (HR) of grade 2–4 acute GVHD was assesed by multivariable Cox regression analysis adjusting with 8 clincal factors. [RESULTS] 1) 220 pairs determined both HPs, 354 one HP, 64 no HP and 74 HP with ambiguility of HP. There was no difference of acute GVHD between these 4 groups (26.7%, 33.2%, 28.6%, 35.8%, respectively). And that, donor and recipient mismatching rate of SNPs was not associated with acute GVHD; less than 5 mismatch SNPs (n=126) showed 32.2%, 6–50 (n=105) 32.4%, 51–100 (n=102) 27.5%, and more than 101 (n=118) 31.4%. 2) Most frequent HP (HP-P1: HLA- A*2402- Cw*1202- B*5201- DRB1*1502- DQB1*0601- DPB1*0901) was found in 331 pairs, and the second HP (HP-P2: HLA-A*3303- Cw*1403- B*4403- DRB1*1302- DQB1* 0604- DPB1*0401) in 111 pairs. 68 out of 72 homozygous HP-P1/P1 individuals had identical homozygous alleles for more than 98% of 912 consecutive SNPs. Of 10 HP-P2/P2 homozygous individuals, all individuals were identical homozygous alleles for 99% of 1310 consecutive SNPs extending from nucleotide 29001906 to 33987897 (4.9 Mb). Further more, 32 out of 34 heterozygous HP-P1/P2 individuals had more than 99% identical consecutive 912 alleles. 3) Considerable number of pairs with HP-P1 made it possible to compare another HPs for the risk of acute GVHD. Notably, 16.2% of acute GVHD in homozygous HP-P1/P1 pair (n=33) and 12.0% of acute GVHD in HP-P1/P2 pair (n=25) were significaitly lower than 39.1% in pair with HP-P1 and HP-P3-45 (n=246) (p=0.01), and HR was 0.41 (p=0.04) and 0.30 (p=0.04) respectively. 4) When analyzed an individual HP, patients with HP-P2 showed significant lower incidence of acute GVHD (22.3% n=111) than HP-P2 negative one (32.7% n=601) (p=0.031), and HR was 0.63 (p=0.032), and the other HPs did no significant difference. [CONCLUSIONS] Donor and recipient mismatching rate of SNPs in HLA region had no correlation with acute GVHD in HLA full matched UR-BMT in JMDP. Common HP-P1 and HP-P2 were highly conserved through HLA-A to HLA-DPB2. Patients with HP-P1/P1 and those with HP-P1/P2 showed lower incidence of acute GVHD, which is compatible with BMT from HLA identical sibling among Japanese. Specific HP (HP-P2)itself reduced the incidence of acute GVHD. These results contribute to favorable outcome of UR-BMT and to ellucidate the mechanism of acute GVHD.
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Turdieva, Sh T., and E. A. Shamansurova. "Features of the endoscopic picture in paediatric gastroduodenal diseases caused by Helicobacter pylori." Russian Journal of Infection and Immunity 10, no. 3 (August 7, 2020): 543–50. http://dx.doi.org/10.15789/2220-7619-fot-1249.

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The aim of the study was to examine the features of the endoscopic picture in the upper digestive tract mucosa in paediatric chronic gastroduodenal pathology (CGDP) associated with Helicobacter pylori. Materials and methods. There were examined 286 patients, aged 6–15 years. Diagnostic criteria for chronic gastroduodenal pathology were anamnestic as well as instrumental and functional studies data: gastric fractional intubation, esophagogastroduodenoscopy (EPGDS) with endoscopic pH-metry without biopsy, and ultrasound examination of abdominal organs. H. pylori testing was carried out by two unrelated methods such as respiratory test and a immunochromatographic fecal test. Results. Detection of H. pylori in children with CGDP peaked in patients with peptic gastric and duodenal ulcer (up to 87.5%, p < 0.05). The main endoscopic signs were edema, hyperaemia and contact bleeding, as well as local haemorrhage were the major endoscopic signs of inflammation in the stomach and duodenum mucosa. Atrophic mucosal lesions were characterized by thinning, pale colour together with transilluminated submucosal vessels. Non-atrophic antral gastritis was featured with delayed gastric emptying, antral stasis and pyloric spasm. In contrast, hypotension of the gastric wall, duodenogastric reflux and decreased motility were more typical to chronic atrophic gastritis. Major endoscopic feature in patients with H. pylori infection was presented by dominant atrophic changes combined with gastroduodenal reflux (77.6%, p < 0.05) compared to patients without H. pylori infection. Conclusion. Detection of HP infection was peaked in children with CGDP coupled to peptic ulcer disease compared to patients with inflammatory diseases (p < 0.05). Endoscopic examination in HP-positive patients showed that atrophic changes were found by 4-fold more frequently together with gastroduodenal reflux compared to patients without HP infection (p < 0.05).
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Dissertations / Theses on the topic "HP 1240"

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Buddensiek, Swantje. "Formen von Heimsuchung." Doctoral thesis, Humboldt-Universität zu Berlin, Kultur-, Sozial- und Bildungswissenschaftliche Fakultät, 2016. http://dx.doi.org/10.18452/17796.

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Die Dissertation untersucht sechs südafrikanische Romane, die in einer Zeitspanne von wenigen Jahren um das Ende der Apartheid entstanden sind. Was sie zu einem Korpus eint, sind auffällige Merkmale, die in dieser Arbeit als Formen von Heimsuchung analysiert und differenziert werden. Heimsuchung meint dabei nicht nur die Suche nach einer Heimat, sondern auch störende Eindringlinge innerhalb der Grenzen des Eigenen: Dies können sowohl unheimliche Phantasmen als auch Gäste sein, die sich nicht an die Regeln derjenigen Ordnung halten, in der sie nun stören. Somit beschäftigt sich die Dissertation mit unsicheren Grenzen zwischen Vergangenheit und Gegenwart, zwischen Räumen des Eigenen und des Anderen, zwischen innen und außen sowie zwischen real und irreal. Die Analysen zeigen, dass Heimsuchungen in den Texten als Subversion einer zeitlichen, räumlichen oder psychischen Ordnung fungieren, als Bedingung sowie zugleich Unmöglichkeit eines „Schlupflochs“ − und als Orientierungsversuch der weißen unsettled settlers.
This dissertation examines six South African novels written towards and after the end of the Apartheid regime. All texts have certain characteristics in common which I analysed and differentiated as forms of Heimsuchung. This German term refers at the same time to the search for a home and to disturbing intruders, like an uncanny phantasm or a guest who does not follow the given rules of the place it resides in. The dissertation thus deals with ambiguous boundaries between past and present, between spaces of one''s own and of ''the other'', between inside and outside, and between real and unreal. The analyses reveal that Heimsuchungen function as a subversion of a temporal, spatial or psychological order, as both a condition for and impossibility of a loophole − and as an attempt at orientation for white „unsettled settlers“.
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Wernebjer, Cervinus Daniel, and Patrik Brorsson. "En Jämförelse mellan EnCase och BackTrack : Examensarbete på programmet IT-forensik och informationssäkerhet, 120 hp." Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-4530.

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Denna rapporten är en jämförelse av forensiska verktyg, i detta fallet är verktygen EnCase och BackTrack. Vi kommer i den här rapporten att jämföra vissa utvalda verktyg som representeras i båda programmen, och analysera resultatet av detta. Analysen och jämförelsen kommer därefter ligga till grund för om man kan få fram lika bra resultat med ett open-source program som med ett program man betalar för. Vi kommer att utföra analysen genom att använda en bevisfil och utföra tester på den i både BackTrack och EnCase. Resultatet kommer att diskuteras och presenteras i denna rapport.För att få fram bästa möjliga resultat kommer vi även att intervjua vissa utvalda personer med erfarenhet utav att arbeta med dessa program, för att få fram deras synpunkter

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Books on the topic "HP 1240"

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Parker, Philip M. The 2007-2012 World Outlook for Consumer Riding Garden Tractors under 16.0 Hp (12.0 KW). ICON Group International, Inc., 2006.

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The 2006-2011 World Outlook for Consumer Riding Garden Tractors under 16.0 Hp (12.0 KW). Icon Group International, Inc., 2005.

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Parker, Philip M. The 2007-2012 Outlook for Consumer Riding Garden Tractors under 16.0 Hp (12.0 KW) in India. ICON Group International, Inc., 2006.

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Parker, Philip M. The 2007-2012 Outlook for Consumer Riding Garden Tractors under 16.0 Hp (12.0 KW) in Japan. ICON Group International, Inc., 2006.

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Parker, Philip M. The 2007-2012 Outlook for Consumer Riding Garden Tractors under 16.0 Hp (12.0 KW) in the United States. ICON Group International, Inc., 2006.

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Conference papers on the topic "HP 1240"

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Wolff, F. H., and J. F. Hustak. "Identification and Resolution of a One-Times Slip Frequency Synchronous Motor Field Start Up Problem." In ASME 1991 Design Technical Conferences. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/detc1991-0232.

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Abstract This paper describes how to detect the presence, and determine the magnitudes, of both one times slip frequency and two times-slip frequency torque pulsations. This is done by using test measurements on a 19000 hp (14168 kW), 1200 rpm (20 hz) synchronous motor/gear/compressor drive train which experienced a premature motor field excitation during commissioning.
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Lu, Shuanlu, Pinsheng Zhang, Changyi Qin, Xinhu Wang, Faqian Luo, and Jie Zhou. "The Analysis on Causes of Rupture of a HP-Nb High Temperature Alloy Radiant Furnace Tube." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93008.

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An explosion accident occurred in a HP-Nb high temperature alloy radiant furnace tube. Twenty one lengths of furnace tubes were broken and cracked during this explosion. This paper investigates the explosion accident. The broken furnace tubes were investigated by fractographic observation and metallographic inspection and with mechanical performance test and analysis to determine the cause of the explosion. The results of the analysis indicated that the failure of the furnace tube was caused by high temperature creep. In order to determine the temperature of the furnace tube failure, some heat simulation tests from 900°C to 1200°C were carried out, the results of which confirmed that the failure of the furnace tube was primarily due to creep fracture because of the high temperature.
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Choe, Bok Seong, Tae Ho Kim, Chang Ho Kim, and Yong Bok Lee. "Rotordynamic Behavior of 225 kW (300 HP) Class PMS Motor-Generator System Supported by Gas Foil Bearings." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-27286.

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This paper presents the dynamic behavior of a 225 kW class (300 HP), 60,000 rpm, permanent magnet synchronous (PMS) motor-generator system supported on gas foil bearings (GFBs). The rotor of a 225 kW PMS motor is supported by two identical gas foil journal bearings (GFJBs) and one pair of gas foil thrust bearings (GFTBs). The total weight and axial length of the coupled rotors are 272 N and 1,042 mm, respectively. During the speed-up test to 60,000 rpm, unexpected large subsynchronous rotor motions appear at around 120–130 Hz above 35,040 rpm. After disassembling the motor, an inspection of the top foils of the GFJBs reveals significant rotor rubbing. Thus, the GFJBs are redesigned to have a smaller load capacity by reducing their axial length to 45 mm. In addition, three 50 μm thick shims are installed in the GFJBs at 120° intervals for reducing the swirl speed of air and producing bearing preloads. The modification delays the onset speed of subsynchronous motions to 43,200 rpm and decreases the amplitude of the subsynchronous motions from 20 to 15 μm. These results indicate that the modification improves the stability margin of the high-speed rotor system with increasing stiffness and damping. In addition, the logarithmic decrement trends are in good agreement with the test results.
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Chiesa, Paolo, Giovanni Lozza, Ennio Macchi, and Stefano Consonni. "An Assessment of the Thermodynamic Performance of Mixed Gas-Steam Cycles: Part B — Water-Injected and Hat Cycles." In ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/94-gt-424.

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Part B of this paper focuses on intercooled recuperated cycles where water is injected to improve both efficiency and power output. This concept is investigated for two basic cycle configurations: a Recuperated Water Injected (RWI) cycle, where water is simply injected downstream the HP compressor, and a Humid Air Turbine (HAT) cycle, where air/water mixing is accomplished in a counter-current heat/mass transfer column called “saturator”. For both configurations we discuss the selection and the optimization of the main cycle parameters, and track the variations of efficiency and specific work with overall gas turbine pressure ratio and turbine inlet temperature (TIT). TIT can vary to take advantage of lower gas turbine coolant temperatures, but only within the capabilities of current technology. For HAT cycles we also address the modelization of the saturator and the sensitivity to the most crucial characteristics of novel components (temperature differences and pressure drops in heat/mass transfer equipment). The efficiency penalties associated to each process are evaluated by a second-law analysis which also includes the cycles considered in Part A. For any given TIT in the range considered (1250 to 1500°C), the more reversible air/water mixing mechanism realized in the saturator allows HAT cycles to achieve efficiencies about 2 percentage points higher than those of RWI cycles: at the TIT of 1500°C made possible by intercooling, state-of-the-art aero-engines embodying the above cycle modifications can reach net electrical efficiencies of about 57% and 55%, respectively. This compares to efficiencies slightly below 56% achievable by combined cycles based upon large-scale heavy duty machines with TIT = 1280°C.
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Al-Kandari, Ayad M. E., Mohammed Jasem Al-Saeedi, Roger H. Kingsborough, Terrell W. Brewster, and David Charles Mckinnell. "Kuwait Oil Company's Latest Semi-Automated Deep Drilling Rig - HAH Rig 124, the Middle East's Most Modern 3000 HP Land Rig." In IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition. Society of Petroleum Engineers, 2006. http://dx.doi.org/10.2118/103943-ms.

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Kedzierski, M. A. "Effect of Al2O3 Nanolubricant on a Turbo-BII R134a Pool Boiling Surface." In ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/mnhmt2012-75024.

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This paper quantifies the influence of Al2O3 nanoparticles on the pool boiling performance of R134a/polyolester mixtures on a Turbo-BII-HP boiling surface. An Al2O3 nanolubricant (a lubricant containing dispersed nano-size particles) was made by suspending nominally 10 nm diameter Al2O3 particles in a synthetic polyolester to roughly a 1.0% volume fraction. The nanoparticles caused, on average, a 12% degradation in the boiling heat transfer relative to that for R134a/polyolester mixtures without nanoparticles for the three lubricant mass fractions that were tested. The degradation was nearly constant for heat fluxes between 20 kW/m2 and 120 kW/m2. It was speculated that the boiling heat transfer degradation was primarily due to a combination of (1) film boiling in the reentrant cavity rendering the nucleate boiling enhancement mechanism of the nanoparticles ineffective and (2) a reduction in bubble frequency due to the increased surface wetting as caused by the nanoparticles. In addition, these degradation factors might be mitigated with increased nanoparticle loading.
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7

Kirova-Yordanova, Zornitza. "Thermodynamic Evaluation of Energy Integration and Cogeneration in Ammonia and Urea Production Complexes." In ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/esda2014-20515.

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Energy integration and cogeneration are commonly used in large mineral fertilizer production complexes for many years. Production of nitrogen fertilizers is an energy intensive industry branch consuming about 5200 PJ of fossil fuels, mainly natural gas. Urea is the major straight nitrogen fertilizer with 46% nitrogen content, and the total production of 155 MM metric tons yearly. About 600–900 kg MP or HP steam and 50–120 kWh electricity per ton urea are consumed in modern low energy urea plants. In this work the exergy method is used to analyze the dependence of the primary energy consumption and GHG emissions in the ammonia and urea production complexes on basic parameters of the subsystems (ammonia and urea production units and CHP plant) and on the allocation of the additional fuel (natural gas) burning and steam generation. The results show that the most effective allocation scheme depends mainly on the relative efficiencies of the subsystems and mashinery (compressors and steam turbines).
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8

Mazur, Zdzislaw, Rafael Garci´a-Illescas, Jorge Aguirre-Romano, and Norberto Pe´rez-Rodri´guez. "Last-Stage Blade Failure Evaluation." In ASME 2007 Power Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/power2007-22010.

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A last stage turbine blades failure was experienced in two units of 660 MW. These units have one high-pressure turbine and two tandem-compound low-pressure turbines with 44-inch last-stage blades. The blades that failed were in a low pressure (LP) turbine connected to the high pressure (HP) turbine (LP1) and in LP turbine connected to the generator (LP2). The failed blades had cracks in their roots initiating at the trailing edge, concave side of the steeple outermost fillet radius. Laboratory evaluation of the cracking indicates the failure mechanism to be high cycle fatigue (HCF). The last-stage blades failure evaluation was carried out. The investigation included a metallographic analysis of the cracked blades, natural frequency test and analysis, blade stress analysis, unit’s operation parameters and history of events analysis, fracture mechanics and crack propagation analysis. This paper provides an overview of this failure investigation, which led to the identification of the blades torsional vibrations near 120 Hz and some operation periods with low load low vacuum as the primary contribution to the observed failure.
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9

Gandhi, Dhruvkumar, Uschas Chowdhury, Tushar Chauhan, Pratik Bansode, Satyam Saini, Jimil M. Shah, and Dereje Agonafer. "Computational Analysis for Thermal Optimization of Server for Single Phase Immersion Cooling." In ASME 2019 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ipack2019-6587.

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Abstract Complete immersion of servers in synthetic dielectric fluids is rapidly becoming a popular technique to minimize the energy consumed by data centers for cooling purposes. In general, immersion cooling offers noteworthy advantages over conventional air-cooling methods as synthetic dielectric fluids have high heat dissipation capacities which are roughly about 1200 times greater than air. Other advantages of dielectric fluid immersion cooling include even thermal profile on chips, reduction in noise and addressing reliability and operational enhancements like whisker formation and electrochemical migration. Nevertheless, lack of data published and availability of long-term reliability data on immersion cooling is insufficient which makes most of data centers operators reluctant to implement this technique. The first part of this paper will compare thermal performance of single-phase oil immersion cooled HP ProLiant DL160 G6 server against air cooled server using computational fluid dynamics on 6SigmaET®. Focus of the study are major components of the server like Central Processing Unit (CPU), Dual in Line Memory Module (DIMM), Input/output Hub (IOH) chip and Input/output controller Hub (ICH). The second part of this paper focuses on thermal performance optimization of oil immersion cooled servers by varying inlet oil temperature, flow rate and using different fluid.
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Sood, V. M. "Ongoing Development of a Gas Turbine Combustion System for Gaseous Fuels With a Wide Range of Wobbe Index Values." In ASME 1988 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1988. http://dx.doi.org/10.1115/88-gt-109.

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Development of a combustion system at the author’s Company was carried out at atmospheric pressure to achieve successful operation of a 5500-hp (Type H) gas turbine on gaseous fuels covering a wide range of Wobbe Index (WI) values from 48.04 MJ/nm3 (1220 Btu/scf) for natural gas to 18.90 MJ/nm3 (480 Btu/scf) for natural gas and carbon dioxide mixtures. Mixtures with the latter composition have direct applications for gas turbine engines burning fuels derived from sanitary landfills and liquid sewage. Wide-range operational capability offers the flexibility to fire gas turbines with either pipeline quality natural gas or medium-heating-value fuel, depending on availability. For such applications, if a fuel injector is designed to operate satisfactorily on natural gas fuel, it will have unacceptably high pressure drops when operating on fuels with WI values towards the lower end of the range. On the other hand, if the fuel injector is designed to operate properly on fuels with WI values on the lower end of the range, it will have unacceptably low pressure drops when operating on fuels with WI values towards the higher end of the range, which causes combustion-driven pressure oscillation feedback into the fuel-injection system. This feedback usually increases the amplitude of combustion-driven pressure oscillation and can cause significant damage to the gas turbine in a relatively short time. This paper describes the design and development work carried out to resolve these problems.
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